MOTION IN WEAVING (Fast reed motion):-

Following are type of warp protecter motion;

1) Fast reed motion (warp protecter motion.)

2) Loose reed motion (warp protecter motion.)

(1) FAST REED MOTION ( WARP PROTECTER MOTION):-

This is an auxiliary motion. The fast reed motion is mostly used to weave heavier weight fabrics. The loom having loose reed warp protecter motion doesn’t get able to weave heavy weight fabric, so that fast reed motion is used in place of loose reed motion in the loom which is getting used to weave heavier weight fabrics. The fast reed motion mechanism stop the loom immediately before beating of pick by reed in case of failure of the shuttle to reach in the shuttle box.

Structure of fast reed motion (mechanism) :-

This mechanism is totally different from loose reed motion. A stop rod is mounted on the loom . This stop rod runs under the sley. Two fingers are mounted on this stop rod. One finger is fitted at at each side of the shuttle box. Each finger presses against the swell mounted in the shuttle box. Two daggers also get mounted on the same stop rod. One dagger is fitted at each side of the shuttle box. The daggers are mounted in such a way that they face the frog. This frog gets mounted in the side wall of the loom . This sliding frog carries a brake lever. The front of the brake lever touches the adjustable bolt which knocks off the starting handle in case of shuttle trapping. The rear end of the brake lever is connected to the brake assembly. A spiral spring is connected with the dagger the sliding dagger touches two vertical spring.

Fig .Fast reed motion ( warp protector mechanism.)

Working principle of fast reed motion (mechanism):-

When shuttle travels from one shuttle box to another shuttle box during weft insertion, the swell mounted in each box feels the presence of a shuttle in the box. The spiral spring mounted on the dagger constantly applies pressure on the finger. The finger presses the swell mounted in the shuttle box. When shuttle reaches the box, it presses to the swell. As the swell get pressed by the shuttle, the finger receives partial rotary motion. Since one end of this finger is connected with dagger, so that the dagger lifts up. Now this dagger passes over the frog without touching it. Thus the sliding frog doesn’t receive any kind of movement and the starting handle position remains unchanged . The loom gets continue to running.

Now suppose that loom is running continuously. If the shuttle gets fails to reach the shuttle box due to any reason , the swell mounted in the in shuttle box doesn’t get pressed by the shuttle. Since the finger receives the partial rotary motion through the swell and it help to lift up to the dagger , so that the dagger remains in front of the sliding frog. Now the dagger pushes to the starting handle knock-off through adjustable bolt mounted on the starting handle. The rear end of the brake lever connected to the brake assembly actuate the loom brake immediately. The loom is stopped without completing the beat up motion. Since the loom stop suddenly, a heavy jerk is absorbed by two vertical spring mounted behind the sliding frog.

(2) LOOSE REED MOTION (WARP PROTECTER MOTION):-

Objective of loose reed motion:-

When a shuttle loom work , there is always a chance to trap the shuttle in the shed . Since the reed performs beating motion, the shuttle gets beaten by the in case of shuttle trapped situation, the beating of the shuttle after trapping is a very serious problem during weaving. Multiple warp breakages get occurred in this situation. The shuttle and reed may be damaged . The loose reed motion mechanism prevents multiple warp breakages, damage to the reed and shuttle.

In this way, we can say that the main objective of the loose reed motion mechanism is to prevent the multiple breakages of warp and damage of shuttle and reed.

Structure of loose reed motion:-

Reed is mounted in the reed case and reed cap . The reed cover arm helps to held the reed firmly. The reed cover arm look in L shape. It gets fulcrummed near the joint of the dagger or stop rod finger . An anti-friction bowl is also presses the bow spring in normal running condition. A spiral spring is also connected with the stop rod. A heater is mounted on the starting handle in such a way that the frog passes under it in normal running conditions. A serrated bracket is mounted on the starting handle. A dagger does not push this serrated bracket in normal working.

Fig. Loose reed motion ( a warp protecter motion)

Working principle of loose reed motion:-

The reed is gripped in between the reed cap and reed case firmly by the reed cover arm. When the shuttle travels from one shuttle box to another shuttle box it exert a pressure on the reed . The tension of the bow spring helps to keep the reed in the reed case firmly. This bow spring does generate the pressure, that gets applied to the reed during beating. Therefore a spiral spring mounted on the stop rod helps to hold the reed firmly in case of beating motion.

In normal condition, the frog gets passed under the heater and the dagger not push the serrated bracket.

When the shuttle gets failed to reach to the opposite shuttle box, the shuttle either flies from the shed or gets trapped in the shed.

When the shuttle gets failed to reach to the opposite shuttle box, the shuttle either flies from the shed or gets trapped in the shed.

We know very well that reed beats every inserted pick after pick insertion.The reed beats the shuttle in case of shuttle trapping. This trapped shuttle causes multiple warp breakage during beating and damage of shuttle and reed.

As the shuttle gets trapped in the shed the loose reed motion mechanism comes into play immediately. The pressure getting applied on the reed during beating motion gets increased in case of shuttle trapping.

This increased beating pressure transferred to the reed cover arm , the bottom baulk of the reed comes out of the reed case and the reed does the reed does strikes to the trapped shuttle hardly, the warp red, and shuttle remains safe.

Since the reed cover arm gets fulcrummed at its fulcrum point, the reed cover arm receives a partial angular motion.

The reed cover arm is connected to the stop rod so that the stop rod lift up. The frog comes over the heater. The heater increases the lift of the frog. The dagger mounted on the stop rod comes in front of the starting handle gets disengaged and the loom gets stopped immediately.

https://www.texileadvisor.com